The bear, wolf, coyote, fisher, wolverine, otter, and lynx prey upon the beaver who is, nevertheless, a powerful antagonist when at bay.

Bobcats, wolverines, and fishers, that know how to flip the animal on its back and expose its unprotected underside, are the most adept at killing porcupines.

This was the kind of place fishers like: a closed canopy, a supply of dead standing trees to make dens in, and plenty of trees of different heights and deadwood on the ground, where a hungry fisher might find prey.